Drill dust-arrester and air-purifier.



. W. E. DWYER. l

DRILL DUST ARRESTER AND AIR PURIFIER. QPPLIOATION FILED vMAB.. 15,1910.

983,986. Patented 12810144911.

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W. E. DWYER.

DRILL DUST ARRESTEB. AND AIR PURIPIER.- i

APPLICATION FILED MAB.15, 1910y Patented Feb. 14, 1911.

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WILLIAM E. DWYER, OF

LEADVILLE, COLORADO.

DRILL DUST-ARRESTER AND AIR-PURIFIER.

Specification of Letters Patent.

Patented Feb. 14, 1911.

Application filed March 15, 1910. Serial No. 549,424.

To all whom 'it may concer/n.

Be it known that I, WILLIAM E. Dwrnn, a citizen of the United States,residing at Leadville, in the county of Lake and State of Colorado, haveinvented certain new and useful Improvements in Drill Dust-Arresters andAir-Purifiers, of which the following is a specification, referencebeing had to the accompanying drawings..

My invention relates to improvements in dust collect-ing and airpurifying devices for use in connect-ion with pneumatic rock drills andthe like.

One object of the invention is to provide a device of this characterhaving an improved swivel connection at one end whereby it isparticularly adapted for a rotating drill.

Another object of the invention is to provide a device ot this characterwhich will not only collect the dust produced by the drill, but alsopurify the air coming from the drill, and which has improved means forconnecting the device to a drill hole, and an improved means forpreventing the escape of dust and preventing its entrance to the swivelconnection.

lith the above and other objects in view, the invention consists of thenovel construction, combination and arrangement of parts, hereinafterfully described and claimed, and illustrated in the accompanyingdrawings in which Figure 1 is a side elevation of my improved dustcollecting and air purifying de vice; Fig. 2 is an enlarged longitudinalsection through one end of the device; Figs. 3,

- 4 and 5, are detail sectional views taken respectively on the planesindicated by the lines 33, 1 -4f and 5-5 in Fig. 2; Fig. 6

-is a detail section taken on the plane indicated by the line 6 6 inFig. 1; and Fig. 7 is a perspective view of the tubular member whichenters the drill hole.

Referring more particularly to the drawings 1 denotes a casing or sheatharranged to surround an ordinary bit B of a drilling machine and adaptedto have at one end an air-tight joint or connection with the drill holeI-I, and at its other end an air-tight or dust proof connection with thedrill or a portion of the drill. This casing is prefen ably made offlexible porous material so that it acts not only as a dust collector,but

as an air purifier. The casing l is provided at itsl opposite ends withreduced tubular portions or necks 2, 3, the former of which receives atubular mouth piece 8 adapted to be inserted in the drill hole. Thistubular mouth piece is preferably made from a sheet of slightlyresilient metal by bending the same into substantially cylindrical formand having its longitudinal edges overlapped so that it may be expandedor contracted to enter different sized drill holes and snugly lit thesame. The mouth piece 3 may be tapered longitudinally if desired, and atits large end it is formed with a stop flange or rib Ll formed byfolding over the said edge of the sheet metal as shown. The tubularportion 2 is retained on the mouth piece by a spring clip 5, and also bya cord 6 which passes through a hem 7 formed around the edge of the neck2, the ends of the cord being drawn tightly around the mouth piece andtied as shown. This is the preferred manner of detachably connecting thecasing to the mouthpiece but it will be understood that other means maybe provided for accomplishing this object.

Secured within the tubular portion or neck 3 of the casing is a swivelconnection consisting of outer and inner tubular members 8, 9, thelatter having a cylindrical bore through which the drill bit B extends.Said inner member 9 has one end 10 thickened and iormed with a radiallyprojecting groove 11 containing an annular groove 12, which latter isadapted to receive an 'inwardly extending annular flange 13 formed atone end of a sleeve nut 14 which is internally screw threaded to engagethe large threaded end 15 of the outer member 8. Said end 15 of themember 8 has the flange 11 abutting against it and it is formed with anannular stop flange 16 against which the sleeve nut 14 abuts when thelatter is screwed inwardly to retain the flange 11 between the flange 13and the member 8. This construction it will be seen permits the innermember 9 to rotate freely. Dust is prevented from' escaping through thebore of the inner member 9 of the swivel by providing a split packingmember 17 which preferably comprises a piece of leather or otherflexible material bent into tubular shape and having one end inserted inthe bore of the swivel member 9 and around the bit, as shown. The innerface of the packing member or washer 17 is preferably lined with felt orother soft material 18 which will prevent the passage of dust, and ifdesired the outer edge of the member or washer 17 may be reinforced by aflexible strip 19 of leather or other material. Dust is prevented fromentering the swivel by providing a somewhat similar packing member 2Oconsisting of a circular band or sleeve of flexible material such asleather provided on its inner face with a soft material 21 such as feltor wool and having attached to it a tubular sleeve 22 of fabric or otheriieXible material which surrounds the sleeve nut 14 and is arrangedwithin the neck 3 of the casing 1. If desired, the packing member orwasher 20 may be a piece of sheepskin with t-he natural wool forming thematerial 21, although if desired, the latter may be felt or other softmaterial which will exclude the passage of dust. The parts 3 and 22 areclamped to the swivel by means of a clamping band 28 preferably made ofa strip of metal which is passed around the exterior of the neck 3 andover the sleeve nut 14. The ends of the clamping band 28 are aperturedto receive a clamping bolt 24, as shown more clearly in Fig. 5.

In operation, it will be seen that the air which passes through thedrill bit B from the exhaust of the pneumatic engine which operates thedrill, will be discharged at the bottom of the drill hole to blow outthe dust and chippings, as indicated by the arrows in Fig. l. The dustand chippings will be collected in the chamber formed by the sack orcasing l and the air will pass through the casing free from injuriousparticles of dust and ore.

It will be noted that the improved swivel connection permits the freerotation of the drill bit without twisting the casing 1.

Having thus described the invention, what is claimed is:

1. rIhe combination with a bit, of a tubular member to surround the bitand contubular form and adapted to be inserted in a drill hole and toexpand therein to effect an air-tight connection, a stop flange on theouter' end of said member, a casing forming a dust collecting chamberand having a tubular neck to receive said member, a drawing string insaid neck of the casing, and a spring clip to retain said neck of thecasing on said member and against said stop flange.

2. The combination with a bit, of a casing to surround the same andprovided at one end with means to effect an air tight connection with adrill hole, and at its other end with a neck, a swivel device arrangedin the neck of the casing and consisting of an inner tubular membersurrounding the bit and formed with an annular flange, and a two partouter member engaged with said flange, a clamp securing the neck of saidcasing to the two 'part outer member of the swivel device, a flexibleannular packing member arranged within the neck of the casing andclamped between the latter and said two part outer member of the swiveldevice, to prevent the entrance of dust between the two members of theswivel device, and a flexible tubular packing member arranged in theouter end of the inner tubular member of the swivel device, and havingon its inner face soft materialto engage the bit and on its outer face asurrounding reinforcing band.

In testimony whereof I hereunto ai'liX my signature in the presence oftwo witnesses.

WILLIAM E. DWYER vWitnesses:

WILLIAM H. CAMPBELL, PATRICK BRENNAN.

structed of resilient sheet metal bent into y

